CN2409389Y - Three-position two-way piston valve - Google Patents

Abstract

The utility model discloses a novel three-position two-way piston valve with one inlet and two outlets. The outlet is divided into 5 chambers by four valve rings and three spacers with through holes. When the piston is in the middle, the two outlets are fully closed; The opposite is true at the stop point; the valve ring is made of soft and highly elastic material (reinforced flexible graphite), and the piston surface is hard and wear-resistant. The piston acts as a seal by tightly hugging the cylindrical surface.

Description

A three-position two-way piston valve

The utility model relates to a piston valve with extended functions, in particular to a piston valve used in the occasion where the medium flows in from the same inlet and must flow out from any one of the two outlets.

Existing above-mentioned occasions all are to connect two pipelines on the same reservoir, install a valve on each pipeline, close one of them, open another, or vice versa, reach the purpose that must communicate with one of them. However, whether it is manual or automatic control, errors may occur, and two simultaneous closings or openings may occur. In industrial production applications, the above errors may cause major problems such as safety and quality.

The task of the utility model is to provide a "two-in-one" piston valve, its function is equivalent to two valves, but better than two valves, it can avoid man-made or self-control errors, and it cannot ensure that there is an outlet to flow out. safety and quality incidents. This valve has an inlet and two outlets, one of which is opened and the other is closed by the movement of the piston, or vice versa. This can prevent the serious consequences of closing and opening errors, which is beneficial to manual or automatic control. It is especially suitable for the occasion where a safety valve is installed at each of the two outlets, which can ensure absolute safety with one backup and one opening; it can also be used in production processes such as one opening and one backup with two pumps pumping materials from the same storage tank.

The task of the utility model is to be finished in the following way: the piston valve valve body is long cylindrical shape, and its bottom is an inlet, and the top is two outlets arranged side by side. The left side of the valve body is the gland, and the right side is the valve cover. In the valve body, through four valve rings and three spacers with through holes, the first inlet and the second outlet are separated into 3 cavities, and the other 2 cavities are formed at the end with the gland and the valve cover, totaling 5 cavities. When the piston is in any of the three positions, there are valve rings on both sides to seal it. Relying on the axial pressure, the valve ring and the piston are tightly hugged through the cylindrical surface to play a sealing role, which can separate each cavity. There are special spring washers under the bolts and nuts of the bonnet and gland studs, whose tension can absorb the influence of pressure and temperature changes, maintain the pressing force, make the seal reliable, and prevent internal and external leakage. By turning the hand wheel to drive the piston to move back and forth to achieve the purpose of three-position two-way: when the piston is in the middle position, it is tightly embraced by the valves on both sides of the inlet, and the inlet and the two outlets are blocked; when it is tightly embraced by the valves on both sides of one of the outlets , the outlet is closed and the other outlet is opened. In terms of design, it can be designed so that the left and right piston stop points are closed, open, and one or two positions, and the center position is generally not used; if the production process requires two outlets to be closed, it can be marked on the valve stem and the valve cover that drive the piston to move back and forth relative position at this time. The other structures of the valve are the same as the ordinary piston valve, only the valve stem is lengthened. The valve ring is made of soft and highly elastic material (reinforced flexible graphite), and the surface of the piston is hard and wear-resistant to ensure reliable sealing and long service life. The valve can be driven manually or pneumatically, electrically, or hydraulically.

The utility model will be described in further detail below in conjunction with the accompanying drawings.

Figure 1 is a cross-sectional view of a three-position two-way piston valve.

The bottom (A) of the long cylindrical valve body (3) is the valve inlet, and the top (B) and (C) are two outlets. The left side of the valve body (3) is the gland (2), and the right side is the valve cover (19). There is a stuffing box (17) on the valve cover (19), which is pressed tightly by the stuffing box gland (18); Copper sleeve (20) is equipped with on (19) and matches with valve stem (14). In the valve body (3), the inlet (A ) and the outlet (B), the outlet (C) are separated into three chambers; at the end valve ring (4) and the gland (2), form another two chambers between the valve ring (13) and the valve cover (19). When the piston is in any of the three positions, there are valve rings on both sides to seal it. The axial pressure of the gland (2) and the valve cover (19) makes the valve ring and the piston (10) tightly hugged by the cylindrical surface to play a sealing role, so that each chamber can be separated. Belleville spring washers (15) are installed under the stud bolts and nuts (16) and (1) of the valve cover (19) and gland (2), and its tension force can absorb the influence of pressure and temperature changes, keep the pressing force, and make the Reliable sealing, no internal or external leakage. The piston (10) is connected with the valve stem (14) by the split nut (11) and the non-rotating disc (12); the handwheel (21) and the copper sleeve (20) are connected together by the nut (22). By turning the hand wheel (21) to drive the piston (10) to move back and forth to achieve the purpose of three-position two-way: the position is limited by the nut (23) on the valve stem (14), when the piston (10) is at the left dead center position, the piston (10) When tightly held by the valve rings (4) and (6) on both sides of the outlet (B), the inlet (A) communicates with the outlet (C), and the outlet (B) is closed; when the piston (10) is at the right dead center position, when the piston (10) is tightly held by the valve rings (8) and (13) on both sides of the outlet (C), the inlet (A) communicates with the outlet (B), and the outlet (C) is closed. If the production process needs to close the two outlets (B) and (C) at the same time, the piston (10) should be in the center position, tightly hugging the valve rings (6) and (8) on both sides of the inlet (A), and the outlet ( B) and (C) are closed at the same time.

This figure shows a manual valve, the valve stem (14) is turned by the hand wheel (21) to make the piston move back and forth, reaching three positions (left dead center, center, right dead center) and connecting with the outlet (B) and connecting with the outlet ( C) The two-way purpose of the pass. This valve also can drive valve rod (14) with pneumatic, electric and hydraulic device, makes pneumatic, electric and hydraulic three-position two-way piston valve.

The utility model can replace two valves, and can ensure that the inlet communicates with any one of the two outlets, and no mistakes will occur no matter whether it is manual or automatic; if there are special requirements, the two outlets can also be closed at the same time. The three-position two-way piston valve also has all the advantages of general piston valves, which are not easy to leak internally and externally, and are easy to maintain.

Claims (3)

1. A three-position two-way piston valve, characterized in that: the oblong valve body (3) has an inlet at the bottom (A) of the valve, and two outlets at the top (B) and (C). In the valve body (3), the inlet (A ) and the outlet (B), the outlet (C) are separated into three chambers; at the end valve ring (4) and the gland (2), form another two chambers between the valve ring (13) and the valve cover (19). When the piston is in any of the three positions, there are valve rings on both sides to seal it. 2. The three-position two-way piston valve according to claim 1, characterized in that: double disc spring washers are installed under the stud bolts and nuts (16) and (1) of the valve cover (19) and gland (2) (15). 3. The three-position two-way piston valve according to claim 1, characterized in that the valve ring is made of soft and highly elastic material—reinforced flexible graphite, and the surface of the piston is hard and wear-resistant.

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